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Reye syndromes is a disease that causes swelling of the brain and liver .The actual cause is unknown but studies has shown that Aspirin is related to the cause of this disease generally in children and teenagers recovering from flu illness.The symptoms are vomiting, nausea, confusion,lethargy,coma, irritable and aggressive behavior.Abnormal laboratoty tests include rise in lever enzymes, ammonia levels and low serum glucose levels.

It is believed that tiny structures within the cell called the mitochondria become damaged. Mitochondria provide cells with energy to the liver for many of the vital functions such as filtering toxins from blood and regulating blood sugar levels. Failure of energy supply to the liver may result in build up of toxic chemicals in the blood which can damage the entire body.It is often seen in children ages 4 to 12. Symptoms are so mild that they go unnoticed. Early detection and treatment are critical but the chances for a successful recovery are greater when Reye Syndrome is treated at its earliest stages. Complications may include coma, permanent brain damage, seizures.